In Act I, we come to see Rance as a symbol of society's perceptions of, and influences on, sexuality. His generally repressive and judgmental nature represents the way in which society tends to suppress sex in all but its most traditional and "normal" forms. At the same time, Rance's determination to leap to conclusions and assumptions represents the way society tends to believe what it wants to believe and doesn't seem interested in genuine understanding. The fact that Rance is obsessive and bizarre about his opinions suggests that society is a little insane when it comes to dealing with sexuality.
What the Butler Saw